Furnace-grate



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' of Fig. 2.

UNiTnn STATES PATENT JOSEPH \V. SHAW, OF ST. LOUIS, MISSOURI.

FURNACE-GRATE.

SPECIFICATION forming part of Letters Patent No. 337,527, dated March 9, 1886.

Application filed OrtObEI 3, 1884. Serial No. 144,673. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH V. SHAW, of St. Louis, Missouri, have made a new. and useful Improvement in Furnace- Grates, of which the following is a full, clear, and exact description, reference being had to the annexed drawings, making part of this specification, inwhich Figure 1 is a horizontal section on the line 1 1 of Fig. 2; Fig. 2, a vertical cross-section; Fig. 3, a vertical longitudinal section on the line 3 3 of Fig. 2; Fig. 4, a vertical longitudinal section on the line 4. 4. of Fig. 2; Fig. 5, a view similar to Fig. 3, but showing the gratebars turned to drop the ashes; and Fig. 6, a view from the inside of the furnace, and being a vertical longitudinal section on the line 6 6 The same letters of reference denote the same parts. I

The present invention is an improvement in that class of furnace-grates which have movable grate-bars.

A represents a improvement is embodied.

B B B represent the grate-bars. They severally consist of'a shaft, 1), suitablyjournaled in the walls aa. ofthe furnace, and provided with a series of disks, 1) b, Figs. 1, 2, 3, 5. The grate-bars are constructed and relatively arranged so that the disks 1) interlap each other, substantially as shown in Fig. 1. The disks b are elongated in a horizontal direction, and at its ends the disk is extended to form or is rovided with a shoulder or projection, b", the projections at the opposite ends of the disk facing in opposite directionsthat 1s, the projection at one end'of the disk faces upward, and the projection at the opposite end of the disk faces downward when the gratears are turned into position to support the fire, as in Figs. 1 and 3. The disks are attached to the shaft in any suitable manner. They may be cast in one piece with the shaft. The shafts b are extended beyond their bearings in the walla, and at their ends are respectively provided with sprocket-wheels if. A chain, 0, extends around and engages with the series of sprocket-wheels b, substantially as shown in Fig. 4. One of the shafts b is exfurnace in which the present tended beyond the point where its sprocketwheel is attached, and is provided with a bevelgear, D, Figs. 1 and 4.

The bevel-gear E upon the shaft E engages with the bevel-gear D. The shaft E extends forward through the front of the furnace, or so that it can be reached and a crank applied thereto-say, to the portion 6 of the shaft. By rotating the shaft E rotary motion is imparted to the shaft b, and by means of the chain 0 and the sprocket-wheels Z) I)" the several grate-bars constituting the grate are caused to rotate; and as the shafts rotate in the same direction, the adjoining shoulders or projections, if, of the disks 1) move in opposite directions. In consequence of this the clinkers and cinders are broken up, and are readily discharged through the grate. On turning the shaft so as to bring the grate-bars and disks 1) into the upright position shown in Fig. 5 ample space is provided between the disks so that the ashes can drop into the ashbox.

Then it is desired to remove any of the grate-bars, the plate F, 2, as indicated by the dotted lines in Fig. 2, there being sufficient looseness of the parts for the purpose, whereupon the shafts I) drop down, and the grate-bars in consequence can be removed from their bearings and furnacewalls.

The plate F can be made in sections f, so that one, two, or more grate-bars can be removed at a time, and when but a section of the plate F is taken out of its place in the furnace-wall thef chain O sags somewhat and sufficiently to allow of the bars in question being withdrawn.

XVhen any of the grate-bars become warped in use, they can be reversed, for the disks b can be used either edge I) uppermost.

I claim- The combination ofthe furnace A, the grate bars B B, having the sprocket-wheels b, the chain 0, the gears D E, and the shaft E, substantially as described.

JOSEPH W. SHAW.

Witnesses:

CHAS. D. MOODY, Conn E. HUNT.

is removed, i 

